The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 20, 1976
Filed:
May. 15, 1973
Catharine Elizabeth Looney, Wilmington, DE (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
Dry leather is dyed with azoic dyes without wetting the leather with water by incorporating into the leather the required diazonium component and any required coupling component in a substantially non-aqueous volatile low-viscosity solvent and incorporating into the leather any other materials required for the coupling reaction in such a solvent or as a vapor. The coupling component can be a natural or synthetic phenolic tanning agent employed in tanning the leather. Dye patterns can be applied to the surface of the leather by using a light-sensitive diazonium component and photo-imaging the surface before effecting coupling. Dry leather is dyed by such processes without significant change in properties.